Benrath line, a term of German linguistics (the maken-machen isogloss)
Franconia is well distant from the Low German-speaking lands, and a term like Booksbüdel would not normally have been understood there.
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In the German linguistics the Benrath line (or Benrather-Linie) is the borderline between the Low German and Middle German dialects, although on both side of the line there is a Rhenish dialect.